I remember there being a 15/16" brake master cylinder that you could swap in to an EG chassis, to replace the 7/8" thats in the vehicle stock. Can anyone confirm this, and what vehicle had the interchangable 15/16" brake master cylinder?

And I remember the 1" being available, but brake lines going to the brake master cylinder needing to be altered, and the 15/16" being a straight swap.

 

The 15/16 can be used from an Integra (RS, GS, LS, SE). If you do not have ABS I suggest you use the Integra RS MC.

 

Correct, no ABS. What years Integra RS?

 

You are thinking of a 1991 Civic EX master cylinder....B18C5-EH2 is the one that figured this out...search his old threads.

The Integra RS one isn't a direct bolt on. You want 91 EX

 

Can anyone confirm this? I thought I remember it coming from an Integra as well.

 

Yes, from a couple of sources actually, I very specifically remember B18C5-EH2s post, I think he started the thread too actually, specifically to say that it works. Its also mentioned in Honda Engine Swaps by Aaron Bonk IIRC.

You can use an Integra 15/16 non ABS MC if you use the corresponding brake booster. I have personally used this setup before.

Why can't you use the Integra MC on a civic booster? The mounting flange is flipped around 180 degrees.

 

I can confirm this on a 94 Si without ABS. I wanted a firmer pedal so I went with the 15/16 from a 91 civic. It was a long time ago, but I am pretty sure it had to be an EX Sedan. It was a direct bolt on, brake pedal was much more firm.

 

They are not from a teg, unless you want to switch your brake booster to a teg. The bolt patterens are opposite. Use 1991 Civic EX SEDAN master cyl. I just did my brake upgrade to full teg brakes SS lines powerslot rotors. Im about 91.475% sure that its the one from the sedan. And yes it is the 15/16 I noticed a huge difference.

 

Thanks so much for the responses... will start my searches for a decent price on one now.

 

I would switch both MC & BB if you're going to do it anyway.

 

If I were to go with the RS booster and brake master cylinder, what years do I go with?

 

'94 - '01

 

oem booster
91 ex 4dr master cyl
40/40 prop valve
94-01 rear teg brakes
oem front discs

badass cheap eg stopping setup.

 

superbean... why would you recommend the oe booster and 91 ex master cyl, over a matched integra booster and master cyl? Any particular reason?

 

streetracin, it would be almost the same thing , just that you would spend less
just getting the 91 ex mc 15/16 your stock booster is fine

 

Maybe because you will get the same result at a smaller price. I am just the type that rather kill two birds with one stone. Like doing the water pump, timing belt, tensioner, gaskets/seals all at once instead of just TB and WP.

 

Yup, that's what I'm using in my EH. It's bolts right in with zero complications.

The pedal is more firm, but it won't do anything for stopping distances.

 

It's for simplicity's sake. No point in spending more money and making it more complicated.

 

how about 40/40 pro. valve, which car?

 

anyone?

 

the integra and civic brake booster/master cylinder flange is flipped 90 degrees, not 180=].
Get the 91 ex civic mc, it lines up with the eg brake lines, unlike the dc ones which will require you to bend the brake lines a little.
40/40 prop valve can be found in eg si and an integra rs model?not 100% sure on the integra part, but it can't be an abs model. I know forsure it can be found on da model integras with no abs.

use ebay, I bought a 91 ex master cylinder from there and it hasn't failed me yet, I'm using a 3030 prop valve and it works fine. But I'm waiting for a chance to grab at a 4040.

 

Quick question for you guy's. I have converted my 1995 Civic DX to SiR (Si in the U.S) brakes all around, which also has disc in the rear. What would be the correct BB/MC to use, and what prop valve should I use as well?

Thanks!

 

You're right.

I've used a non ABS Integra master cylinder and booster on a 5th gen civic before (It was cheap and available, '91 EX MCs aren't in Canada and we were pretty sure the stock booster was bad anyway) the lines matched up perfectly.

5th gen Sis don't use a 4040 prop valve, they're 3040, ive personally removed them to swap them with a 4040 valve.

 

maybe the brake lines are different because it was an abs one, not an integra one.

yeah, I could've sworn it also came from the si, but you are the one who helped me out on my brake swap and I can't find the information i'm looking for to back me up so you got me=].

 

Ok, so the recommended setup is as follows...

92-95 Civic Brake Booster
91 Civic EX Sedan Brake Master Cylinder
40/40 Prop Valve (Off of what?)